Autoscale PointCloud if no limits set (#706)
Autoscale PointCloud if no limits set (#706)

Otherwise the latest point visualized sets the scale and
everything collapses to that point.
grigorisg9gr/menpo,patricksnape/menpo,yuxiang-zhou/menpo,patricksnape/menpo,patricksnape/menpo,grigorisg9gr/menpo,yuxiang-zhou/menpo,menpo/menpo,yuxiang-zhou/menpo,grigorisg9gr/menpo,menpo/menpo,menpo/menpo